题目内容

__________

A. before
B. after
C. in front of
D. as

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石膏胶凝材料是一种以（）为主要成分的气硬性无机胶凝材料。

A. CAO
B. CA(OH)2
CAS0。
D. CAC0、

__________

A. everything
B. other thing
C. something
D. nothing

He couldn’t explain the _______ of ten years in his job history．

A. gap
B. interrupting
C. opening
D. margin

Somethingalways _______ wrong when we try this recipe．

A. has gone
B. have gone
C. go
D. goes